I'm rebuilding a 1954 HUDSON 308 engine. I have choice of 2 heads to install on engine. One head is stamped on top- Power Dome, 308, cwc309121, E76. The second head is stamped on top- H-145, Super Power Dome, Use Premium Fuel, 305854, 4-16-51. What does all these numbers and letters mean? Does it matter which head I choose? They both magnaflux ok.
Use the H145 one, it is higher compression.
Hudson Engine Heads: provided DJ Kava
The July, 1951 Hudson Service Merchandiser notes the following about 1951 heads: "Beginning with the 1st production, an aluminum head of 7.2:1 compression ratio was standard. The marking on top of cylinder head was H-145 Super Power Dome-304632 (this is casting number). The optional cylinder head was of cast iron, 6.7:1 ratio, with marking H-145 Power Dome-304630.
Later, a cast iron cylinder head, 7.2: ratio, was used as standard-marking H-145 Super Power Dome-305923, and a metal tag with the imprint USE PREMIUM FUEL. The present and final change for standard head 7.2: ratio is of a new casting with marking H-145 Super Power Dome Use Premium Fuel-305854."
The metal tag head was simply standard equipment.
From a posting on my website: https://hudsonrestoration1948-54.com/Engine.htm
CWC stands for the foundry that cast this head, Campbell Wyant and Cannon of Muskegon Michigan.
date code, E76 is for May 7th 1956.
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